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ISTANBUL, TURKEY - DECEMBER 08: A man looks at Islamic holy books at a library inside Istanbul's famous Blue Mosque on December 8, 2016 in Istanbul, Turkey. The Blue Mosque, one of Turkey's most visited tourist sites, will undergo the most extensive renovations since being built. The renovations are expected to begin in 2017 and take approximately three and a half years to complete. The project will see work done to the mosques tiles, main dome, outer marble layers, all minarets and a refurbishment of the underground drainage system. (Photo by Chris McGrath/Getty Images)